Swiveled base.



UNITFDl STATFS PATENT' OFFIOF.

JOHN G. OORBFTT, oF WAYNESBORO, PENNSYLVANIA, ASSIGNOR To THF FMMFRTMANUFACTURING OOMPANY, OF WAYNFSBORO, PENNSYL- VANIA.

SWIVELED BASE.

Patented May 28, 1907.

To aJ/Z whom t may con/cern,.-

Be it known that I, JOHN G. CORBETT, a citizen of the United States,residing at Waynesboro, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Improvements inSwiveled Bases; and I do hereby declare the following turned around toany desired position; and

it consists in the novel construction and combination of the partshereinafter fully described and claimed. I

In'the drawings, Figure 1 is a vertical section through the swiveledbase. Fig. 2 is a plan view of the upper plate. Fig. 3 is a plan view ofthe lower plate. Fig. 4 is a detail side view of the locking cam andboss.

A is the lower plate which is provided with lugs b and suitable boltsfor securing it to any stationary object such as a work bench or table..This plate A has a central hole B and an annular dovetailed groove Carranged concentric with the said hole. The dove tailed groove is openat the upper side of the plate, and at one oint of its bottom a hole oropening c is provided of the full width of the bottom of the saidgroove.

Dis the upper base plate which is rovided with a circular projection dwhic is .journaled in the central hole B of the lower base plate so thatthe upper plate is revoluble `portions of vertical plates or webs whichproject from the upper plate and which assist in supporting the articleand holding it in position.

F is a locking bolt rovided with a rectanguiar and dovetailed cad f atits lower end. This bolt is inserted upwardly through the hole c so thatits head engages with the dovetailed groove or slot C. The groove C isonly slightly undercut so that the head f of the bolt is drawn intoengagement with it gradually and with some elasticity of action, and

is not drawn up to a sudden stop aswhen a T-shaped groove is used.

The groove C is covered by the upper plate so that no dirt can get intoit.

Gis a boss on the upper plate which is provided with an inclined or camsurface g at its top. The bolt F passes through a hole in this boss andplate, and is provided with nuts h which are screwed on its to endportion.

I is a locking lever provide with a boss t' at one end having aninclined or cam-shaped face which is arranged in contact with theinclined face g. The boss of the locking lever is mounted on the lockingbolt between the nuts and the boss on the lower plate. The two platesare locked together by moving the locking l'ever in one direction, andare unlocked by moving the lever in the reverse direction. A very smallmovement of the lever is sufficient to lock and unlock the lates, and avery ine adjustment of the locking device is afforded by the nuts h. Thelocking bolt is prevented from revolving by its square or rectangularhead which engages with the dovetailed groove.

The locking boss G may be formed integral with the upper plate as shown,or it may be secured to it in any approved manner so as to be renewedwhen worn.

A swiveled base constructed in this manner is very efficient, and hasthe importantadvantage of having no openings, holes or slots in whichdirt, chi s or shavings can lodge, and thereby interfere with its freeworking. This swiveled base is principally used by mechanics forsupporting work, tools and other articles, but 1t may be used as adisplay stand and for other purposes to which it is applicable.

What I cla-im is:

1. The combination, with two plates pivotally connected together, one ofthe said plates having an annular groove and the other Said plate havinga stationary and rigid boss provided with a guide-hole and having aninclined face, of a non-revoluble bolt slidable in the said guide-holeand having a head at one end which engages with the said groove, a nuton the projecting end portion of the said bolt, and a locking-devicepivoted on the said bolt between the said nut and boss and havingV aninclined face which engages with the inclined face of the yboss and IOOgroove, a nut on the projecting end portion of the said bolt, and alooking-device plvoiod on the said bolt between the said nut and bossand having an inclined face which on- 15 gages with the 'face of thesaid boss.

In testimony whereof l have aIiXe/d my' signature in the presence olltwo witnesses. JOHN G. C() RBETIV. Wvitnesses GEO. H. RUSSELL, ALF. N.RUssnLL.

